package com.ma.concurrency.example.commonUnsafe;
/**
 * StringBuilder
 */

import com.ma.concurrency.annoations.NotThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
@Slf4j
@NotThreadSafe
public class StringExample1 {
    //请求总数
    public static int clientTotal = 5000;
    //同时并发执行的线程数
    public static int threadTotal = 200;

    public static StringBuilder stringBuilder = new StringBuilder();

    public static void main(String[] args) throws InterruptedException {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for(int i = 0;i < clientTotal ; i++)
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    update();
                    semaphore.release();
                } catch (Exception e) {
                    log.error("exception",e);
                }
                countDownLatch.countDown();
            });
        countDownLatch.await();
        executorService.shutdown();
        log.info("Size:{}",stringBuilder.length());
    }
    public static void update(){
        stringBuilder.append("1");
    }
}
